Senior ISSE — DoD Security Engineer (Secret Clearance Preferred)

Cyber Defense Technologies; Westford (MA); On-site; USD 120,000 - 180,000; Full time

Job summary

Cyber Defense Technologies (CDT) is seeking an experienced ISSE for a DoD program in Westford, MA. This on-site role provides security engineering, systems administration, and information assurance support to the program.

Qualified candidates hold an active Secret clearance (Top Secret preferred) and have hands-on experience with RMF/NIST/NISPOM, VMware, Linux, Windows, HBSS, and network security. Join CDT to contribute to secure, compliant, and resilient enterprise systems.

Qualifications

• 8+ years deploying, configuring, maintaining, and monitoring systems and networks.
• Previous team leadership experience.
• Experience with highly technical solutions and stakeholder reporting.
• Certifications such as CISSP, CCNA, Security+, RHCSA, or similar.

Responsibilities

• System Administration: administer, maintain, upgrade, and ensure readiness of classified systems and technologies.
• Security Testing: perform continuous monitoring and vulnerability testing with ACAS/Nessus.
• Vulnerability Remediation: implement mitigations and patching requirements.
• Networking: maintain and upgrade switching, routing, and firewalls.
• HBSS Maintenance: maintain HBSS installation and upstream connection.
• Documentation & Procedures: create and maintain procedural docs with ISSO team.

Skills

System administration

Security testing

Vulnerability remediation

Networking

HBSS maintenance

Documentation

Ansible automation

PowerShell

VMware vSphere

Windows deployment

Linux (RHEL)

Network engineering

Tools

ACAS/Nessus

Palo Alto

Cisco switches

Windows Server

Red Hat Enterprise Linux

Job description

Cyber Defense Technologies (CDT) is seeking an experienced ISSE for a DoD program in Westford, MA. This on-site role provides security engineering, systems administration, and information assurance support to the program.

Qualified candidates hold an active Secret clearance (Top Secret preferred) and have hands-on experience with RMF/NIST/NISPOM, VMware, Linux, Windows, HBSS, and network security. Join CDT to contribute to secure, compliant, and resilient enterprise systems.